Photographic shutter.



Patented Nov. 26, |90I.

F. A. noEBucK.

`PHOTOGRAPHIC SHUTTER.

(Application med Feb. 23, 1901.)

(no liiidel.)

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FRANK ALBERT ROEBUCK, OF VEST DULVIOII, ENGLAND.

PHOTOGRAPHIC SHUTTER.

SPECIFICATION forming part of Letters Patent No. 687,385, dated November 26, 1901.

Application filed I'ebruary 23, 1901. Serial No. 48,422. (No model.)

To @ZZ whom t may concern:

Be it known that I, FRANK ALBERT Ron- BUCK, a subject of the Queen of Great Britain and Ireland, residing at 39 Rosendale road, West Dulwich, in the county of Surrey, England, have invented new and useful Improvements in Photographic Shutters, of which the following is a specification.

This invention relates to improvements in photographic shutters, the object being to provide an appliance of that kind which shall be cheap and simple in construction and permit of instantaneous as well as time exposures being made. Itis reallya modification of that class of shutters known as rebound* ing ones.

In carrying my invention into effect I proceed in or in about the following manner,

' making reference tothe accompanying drawings, in which- Figure 1 is a front View, and Fig. 2 a side View, of my improved shutter.

I provide a base-board a of suitable dimensions and having an aperture b and proper arrangements for attaching it to the hood or tube of the lens. A shutter c is also provided to run up and down freely in guides CZ at each side of the board a, the stop d' preventing t-he shutter from running completely out at the bottom of the board. At one side of the board is a lever e, pivoted thereto at or about the center of its length, the lower end of the lever e being drawn normally toward the board a by a suitable springf. Between this lower end of the lever c and the board is a pneumatic release-teat g, operated by a tube h and a bulb in the usual manner. At'the lower end of the lever c is an arm t', projecting toward the center of the width of the shutter c, and at the upper end of the arm is a spring-fingerj, which points toward the center of the shutter, but of less length than the arme' at the lower end of the lever e. to be movable upward, but so as not to move downward farther than into the horizontal position. A knob 7c is provided in the center of the shutter c, and near the bottom of the shutter is a groove Z, in which can be moved to and fro a pin m, which stands outn This spring-iingerjis pivoted so as ward beyond the arm and can be pushed to either end of the grooves, as may be required. At the upper end of the base-board d are two elastic bands, one, n, being nearer the board a than is the other one, o.

As an instantaneous shutter the appliance is used by pushing the pin m as far as possible toward the center of the shutter o and so as to be lbelow the arm 1I. The spring o is then drawn down over the knob 7c. On applying pressure to the pneumatic bulb the lower end of the lever e is raised by the eX- pansion of the teat g, and this allows the pin m to pass under the arm t' and the spring o to draw the shutter c upward. When the knob 71; strikes the band n, the shutter o is impelled downward again, thus acting as an ordinary rebounding one.

When the shutter is to be used for time exposures, it is set as before,exoept that the piu m is moved to the other end of the groove Z. On pressing the bulb the shutter c shoots up as before, the piu m pressing up the finger j as it goes by. As the ngeryA is drawn back to its normal (horizontal) position by the spring u directly the pin m has passed the shutter c cannot rebound below the fingerj owing to the pin m being caught by the upper side of the finger, where it will remain as long as the bulb is pressed. When pressure is removed from the bulb, the lower end of the lever e is drawn back by the spring f, the upper end being simultaneously raised and allowing the shutter c to fall and complete the exposure.

What I claim as my invention, and desire to secure by Letters Patent, is

In photographic shutters, a base-board having therein a lens-aperture: guides at each side of the base board: a shutter to run freely in the said guides: a knob on the said shutter; an elastic band for drawing up the shutter: an elastic band for impelling it downward: a lever pivoted' at the center of its 'length to one of the said guides: a spring to draw the lower end of the lever toward the base-board; a spring-linger at the upper end of the said lever: a pneumatically-operated teat between the lower end of the said lever and the base-boardz an arm projecting from IOO the lower end of the lever and extending In testimony whereof I have signed my v across the width of the shutter: a pin movname to this specification in the presence of able to and fro in a groove provided across two subscribing witnesses.

the bottom of the shutter: and a stop on the FRANK ALBERT ROEBUCK. 5 base-board to limit the downward movement Witnesses:

of the said shutter, substantially as de- ARTHUR OARRIOK,

scribed, WALTER ALBERT GREEN 

